Update readme.md (#365)

* Update readme.md

Updated language to refer to creating and IoT Hub application (vs IoT Central)
Updated links to point to the IoT Hub versions of corresponding articles in the docs

* Update readme.md

Author: timlt

STMicroelectronics/B-L4S5I-IOT01A/readme.md

@@ -12,12 +12,12 @@ products:
 
 # Connect an STMicroelectronics B-L4S5I-IOTOA1 Discovery kit to Azure IoT
 
-[![Quickstart article](../../docs/media/docs-link-buttons/azure-quickstart.svg)](https://docs.microsoft.com/azure/iot-develop/quickstart-devkit-stm-b-l4s5i)
+[![Quickstart article](../../docs/media/docs-link-buttons/azure-quickstart.svg)](https://docs.microsoft.com/azure/iot-develop/quickstart-devkit-stm-b-l4s5i-iot-hub)
 [![Documentation](../../docs/media/docs-link-buttons/azure-documentation.svg)](https://docs.microsoft.com/azure/iot-develop/)
 
-The **Quickstart** button above provides the complete steps for creating an IoT Central application and then configuring, building and flashing the device.
+The **Quickstart** button above provides the complete steps for creating an IoT Hub application and then configuring, building and flashing the device.
 
-For guidance on connecting additional devices, see the [Embedded device quickstarts](https://docs.microsoft.com/azure/iot-develop/quickstart-devkit-mxchip-az3166).
+For guidance on connecting additional devices, see [Getting started with IoT device development](https://learn.microsoft.com/en-us/azure/iot-develop/about-getting-started-device-development).
 
 ## What you need